sorted_list.txt ==> sorted_list.dat

[asher-stern]

In README.md

In "usage": typo: ./lookup-service.py sorted_list.txt, it should be (I think) ./lookup-service.py sorted_list.dat

[murphp15]

@asher-stern
Did you get this working?
When I use the dat file I get the following issue UnicodeDecodeError: 'utf-8' codec can't decode byte 0xd8 in position 2: invalid continuation byte